CMake: Rename some constants

Rename some constants to get a bit more consistency into the
naming scheme. I am so tiered of missing a constant due to it
not having _ in the expected places!

Change-Id: Ibb5e82ea4e25ccb559352839b96c8a64394f3085
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/mcusupport/mcusupportoptionspage.cpp

@@ -90,7 +90,7 @@ McuSupportOptionsWidget::McuSupportOptionsWidget()
         mainLayout->addWidget(m_statusInfoLabel);
         connect(m_statusInfoLabel, &QLabel::linkActivated, this, []{
             Core::ICore::showOptionsDialog(
-                        CMakeProjectManager::Constants::CMAKE_SETTINGSPAGE_ID,
+                        CMakeProjectManager::Constants::CMAKE_SETTINGS_PAGE_ID,
                         Core::ICore::mainWindow());
         });
     }